Here???s some of the bad news about sedentary lifestyles:??? Forty percent of children ages 5 to 8 show at least one heart disease risk factor, including hypertension and obesity, which among children has doubled over the past two decades.??? The first signs of arteriosclerosis (hardening of the arteries) are appearing at age 5 ??? something never before seen in anyone under the age of 30.??? Chil